How will the prices be comparable to NetFlix or HBO GO and similar?
I guess, nobody knows this so far, because I never read anything about the price.
The price will depend on the movie quality (resolution), not every movie needs to be watched in 4k.
But one thing is for sure, they have to be cheaper than netflix, otherwise nobody will use Cryptoflix
Price depends on quantity? I don't think it's their plan. There is a feature to restrict the quality to save bandwidth.